1. From the Departments of Epidemiology and Biostatistics and
2. From the Departments of Epidemiology and Biostatistics and2Ophthalmology, Erasmus Medical Center, Rotterdam, The Netherlands;
3. From the Departments of Epidemiology and Biostatistics and3The Netherlands Ophthalmic Research Institute, Royal Academy of Arts and Sciences (KNAW), Amsterdam, The Netherlands; and4Department of Ophthalmology, Academic Medical Center, Amsterdam, The Nethe